The Devils' Lair
Enter the the territory belonging to the House of Devils. Find the Servitor known as Sepiks Prime and destroy him. Complete strike "The Devils' Lair."
"The Fallen regard the Servitors as gods, but I've had a chance to scan them. I'm not impressed. They're just hyper-advanced frames! I'll be happy to see this Fallen 'deity' put on the scrap pile."